New details have emerged on Microsoft's project to create an operating system aimed at taking over when it retires Windows.
Called Midori, it is an internet-based system, unlike Windows, which is tied to a single PC.
Microsoft is planning for Midori to replace Windows, which many believe will struggle to meet modern working patterns: increasingly mobile and using ever more devices to work on text, pictures, spreadsheets or e-mail.
Internal Microsoft documents set out the strategic options for the development of Midori, according to SD Times.
The publication says that the documents show that Microsoft's preference is for an "orderly replacement strategy" to move millions of users away from Windows to Midori, rather than "breaking sharply with its past".
The documents outline options for different approaches on the extent to which Midori and Windows would work together.
Meanwhile, Microsoft is expected to ship the next version of its operating system, Windows 7, by January 2010.
In a statement, Microsoft said, "Midori is one of many incubation projects underway at Microsoft. It is simply a matter of being too early in the incubation to talk about it".